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 2016-03-22, 19:17 #1772 amphoria     "Dave" Sep 2005 UK AD816 Posts You wait around for ages for a prime ... and then 3 come along at once! 4063*2^2309263-1 (695162 digits) 4063*2^2310187-1 (695440 digits) 4063*2^2313843-1 (696540 digits)
2016-03-22, 19:33   #1773
pepi37

Dec 2011
After milion nines:)

3·11·43 Posts

Quote:
 Originally Posted by amphoria You wait around for ages for a prime ... and then 3 come along at once! 4063*2^2309263-1 (695162 digits) 4063*2^2310187-1 (695440 digits) 4063*2^2313843-1 (696540 digits)
This is closest triplet of primes in row I know!
Congratulations!
And in average you wait about 10 days between primes, not ages :)

2016-03-25, 19:23   #1774
amphoria

"Dave"
Sep 2005
UK

1010110110002 Posts

Quote:
 Originally Posted by pepi37 This is closest triplet of primes in row I know! Congratulations! And in average you wait about 10 days between primes, not ages :)
The reference was intended to be for k=4063 where the last prime was for n=738843, although in reality I was just stealing the saying about buses (at least in the UK).

2016-03-25, 20:35   #1775
pepi37

Dec 2011
After milion nines:)

3×11×43 Posts

Quote:
 Originally Posted by amphoria The reference was intended to be for k=4063 where the last prime was for n=738843, although in reality I was just stealing the saying about buses (at least in the UK).
So in whole world situation for buses is same: you wait it for ages ( or at least 10 days)

 2016-04-09, 06:35 #1776 pinhodecarlos     "Carlos Pinho" Oct 2011 Milton Keynes, UK 23·13·47 Posts 143*2^2007888-1 is prime! (604437 decimal digits) Time : 1351.837 sec. from SMD.
 2016-04-14, 01:43 #1777 VBCurtis     "Curtis" Feb 2005 Riverside, CA 474710 Posts 13*23527315-1. 1061829 digits. That's 3 over 3M for k=13, and 5 over 2M!
2016-04-14, 10:17   #1778
paulunderwood

Sep 2002
Database er0rr

19×191 Posts

Quote:
 Originally Posted by VBCurtis 13*23527315-1. 1061829 digits. That's 3 over 3M for k=13, and 5 over 2M!
Congrats

2016-04-15, 06:47   #1779
PawnProver44

"NOT A TROLL"
Mar 2016
California

197 Posts

Quote:
 Originally Posted by paulunderwood Congrats

:chicken:

:rainbow:

:fireworks:

How do you do these things?

How to find a prime like the one above except 52*3^n+/-1, or some other k. b = 2 to 16 (the bases)

Last fiddled with by PawnProver44 on 2016-04-15 at 06:52

2016-04-15, 11:52   #1780
paulunderwood

Sep 2002
Database er0rr

362910 Posts

Quote:
 Originally Posted by PawnProver44 How to find a prime like the one above except 52*3^n+/-1, or some other k. b = 2 to 16 (the bases)
Efficiently, you sieve, then you use LLR. I am not sure about which sieve to use

If you are bent on finding a mega-prime, start with testing those.

(mods please feel free to detach this sub-thread)

 2016-04-22, 12:53 #1781 amphoria     "Dave" Sep 2005 UK 23×347 Posts 4161*2^2240358-1 (674419 digits)
 2016-04-26, 11:29 #1782 amphoria     "Dave" Sep 2005 UK 53308 Posts 4161*2^2326875-1 (700463 digits)

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